Feixiao, The Merlin's Claw

Eminence — At the beginning of combat on
your turn, if Feixiao, The Merlin's Claw is
in the command zone or on the battlefield,
another target Cat you control gets +3/+3
until end of turn.

Whenever another Cat you control attacks,
you may pay {1}{g}{w}. If you do, it gains
trample and gets +X/+X until end of turn,
where X is its power.